Revise GCSE Physics

Question:What can be done to reduce the risk to life on Earth of NEO's?

The most important thing is to find NEO's and keep track of them, so that we will have some warning of an impact ahead of time.

We search for NEO's constantly using telescopes and satellites.

Once an object has been found its position is constantly monitored using satellites.

Without advance warning, nothing could be done about it.